question on instances

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  • Alan Lee
    #1

    question on instances

    Hi, I am wondering if there is a way to create a class where only one
    predefined instance is allowed. I am just trying to find a way to create a
    global variable with its own member functions whhich would be accessible by
    all other classes. I could just follow the normal class thing but I'm
    wondering if there is a better way to do it.thanks .


    Tags: None
    • Pete
      #2
      Re: question on instances

      Alan Lee wrote:[color=blue]
      > Hi, I am wondering if there is a way to create a class where only one
      > predefined instance is allowed. I am just trying to find a way to
      > create a global variable with its own member functions whhich would
      > be accessible by all other classes. I could just follow the normal
      > class thing but I'm wondering if there is a better way to do
      > it.thanks .[/color]

      Google for the "Singleton pattern", or put your data and functions into a
      namespace.

      - Pete


        Comment

        • Pete
          #3
          Re: question on instances

          Alan Lee wrote:[color=blue]
          > Hi, I am wondering if there is a way to create a class where only one
          > predefined instance is allowed. I am just trying to find a way to
          > create a global variable with its own member functions whhich would
          > be accessible by all other classes. I could just follow the normal
          > class thing but I'm wondering if there is a better way to do
          > it.thanks .[/color]

          Google for the "Singleton pattern", or put your data and functions into a
          namespace.

          - Pete


            Comment

            • jeffc
              #4
              Re: question on instances


              "Alan Lee" <alanlee@stanfo rd.edu> wrote in message
              news:c4sb6f$9rh $1@news.Stanfor d.EDU...[color=blue]
              > Hi, I am wondering if there is a way to create a class where only one
              > predefined instance is allowed. I am just trying to find a way to create[/color]
              a[color=blue]
              > global variable with its own member functions whhich would be accessible[/color]
              by[color=blue]
              > all other classes. I could just follow the normal class thing but I'm
              > wondering if there is a better way to do it.thanks .[/color]

              Search the web for the "singleton" pattern. Typically, you must make the
              constructor private or protected, and then provide a static function that
              users can call to get a new object. It will only allow 1 object to exist at
              a time.


                Comment

                • jeffc
                  #5
                  Re: question on instances


                  "Alan Lee" <alanlee@stanfo rd.edu> wrote in message
                  news:c4sb6f$9rh $1@news.Stanfor d.EDU...[color=blue]
                  > Hi, I am wondering if there is a way to create a class where only one
                  > predefined instance is allowed. I am just trying to find a way to create[/color]
                  a[color=blue]
                  > global variable with its own member functions whhich would be accessible[/color]
                  by[color=blue]
                  > all other classes. I could just follow the normal class thing but I'm
                  > wondering if there is a better way to do it.thanks .[/color]

                  Search the web for the "singleton" pattern. Typically, you must make the
                  constructor private or protected, and then provide a static function that
                  users can call to get a new object. It will only allow 1 object to exist at
                  a time.


                    Comment

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